We see in the Maze Runner(2014) that when Minho and Thomas had found a way out of the maze, the maze started collapsing around them and they only just survived. The maze was throwing currents of ripped up concrete everywhere as shown below:
So, the very next day when half the Glade was wiped out from the Grievers, there aren't very many Gladers left, so... Thomas put up an offer to the other Gladers (as well as Teresa) to get out of the maze and most of the main Gladers went with him.
When they were going through exactly the same sector of the maze, the maze walls were fully intact, no dust anywhere and not so much as a crack or broken chunk of concrete.
How is this possible in less than 24 hours?
Please note: (the Gladers got out in less than 24 hours after discovery of the exit) and for the fact that the kill of the glade from the grievers went for most of the night and would have had to go back to the griever hole and regenerate, so how did that maze sector become intact again?